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Geometry Calculator

Area, perimeter, surface area and volume for every common shape.

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Shape

Quick Tool Overview

The Geometry Calculator covers the standard shapes in one place: area and perimeter for nine 2D shapes, surface area and volume for six 3D solids. Every result is printed with the formula and the substituted values, so the page works as a reference as well as a calculator.

What it does
Calculates area, perimeter, surface area and volume
You give it
A shape and its dimensions
You get back
The measurements with the formula and substituted values
Best for
Homework, DIY projects, materials estimates and design work
Calculators Free, unlimited use No sign-up Runs in your browser

About the Geometry Calculator

One calculator for the standard shapes. In two dimensions it handles the rectangle, square, triangle, circle, ellipse, trapezoid, parallelogram, rhombus and regular polygon, returning area and perimeter. In three it covers the cube, box, cylinder, sphere, cone and pyramid, returning surface area and volume.

Every result is printed with the formula and the substituted values, so the page works as a reference as well as a calculator. That matters for the shapes people half-remember: the area of a trapezoid is the average of the two parallel sides times the height, and a cone's surface area needs the slant height rather than the vertical one, which the calculator derives for you from the radius and height.

Key features of the Geometry Calculator

Nine 2D shapes

Rectangle, square, triangle, circle, ellipse, trapezoid, parallelogram, rhombus and regular polygon.

Six 3D solids

Cube, box, cylinder, sphere, cone and pyramid, returning surface area and volume.

Formulas shown with your numbers

Each answer prints the formula and the substitution, which is what makes it usable as a reference.

Slant height derived for you

A cone's surface area needs the slant height rather than the vertical one, and the calculator works it out from the radius and height.

Inputs adapt to the shape

The fields change to exactly the dimensions the chosen shape needs, so nothing is ambiguous.

How to use the Geometry Calculator

  1. 1

    Choose 2D or 3D

    Pick whether you are working with a flat shape or a solid.

  2. 2

    Select your shape

    The input fields change to match the dimensions that shape needs.

  3. 3

    Enter the dimensions

    Results are calculated as you type, with the formula shown beneath each one.

Frequently asked questions

Area is the space inside a shape, measured in square units. Perimeter is the distance around its edge, measured in linear units. For a circle the perimeter is called the circumference.

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